[EricH]

The "tipping rule" specifically calls out "Strategies aimed at...", and includes just about any "standard" method of disabling another robot.

The problem is that by saying "Strategies aimed at", it forces the refs to judge intent. Generally, if it's a single hit, the robot goes over, and the hitting robot was already scooting for the far side of the field, it's not going to be obvious that there was intent. OTOH, if you're pushing, the robot goes up, and you have a chance to back off but keep pushing, there's at least a 50-50 chance that the refs rule the intent (and thus the strategy) was there and the head ref shows up in front of your player station with a card in hand.